Warm-air heating furnace



Dec. 11, 1923.

J.'SYLVAN WARM AIR HEATING FURNACE Filed Jan.

Patented Dec. 11, 1923.

UNITED STATES JOSEPH SYLVAN, OF CICERO, ILLINOIS.

WARM-AIR HEATING FURNACE.

Application led January 30, 1922. Serial No. 532,643.

To all whom t 'may concern:

Be it known that I,A JOSEPH SYLVAN, a citizen of the United States, anda resident of Cicero, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Warm-Air HeatingFurnaces; and I do hereby declare that the following is a full, clear,and exact descr1ption thereof, reference being had to the accompanyingdrawing, and to the letters of reference marked thereon, which form apart of this specification.

This invention relates to improvements in warm air heating furnace andconsists of the matters hereinafter described and more particularlypointed out in the appended claims.

One of the objects of the present invention is to provide a heatingfurnace which is so constructed as to eliminate the escape of gas,smoke, or dust from the interior of the combustion chamber, into the airheating space surrounding the same.

Another object of the invention is to so construct the furnace that itsinterior may be quickly. and readily cleaned, from the outside of thefurnace, by a simple and efficient means, the accumulated soot and dustbeing directed into the firepot to be consumed therein.

These objects of the invention, as well as others, together With themany advantages thereof, will more fully appear' as I proceed with myspecification.

In the drawing Figure 1 represents a vertical section through a Warm airheating furnace embodying my invention;

Figure 2 represents a horizontalsection through the furnace, taken onthe line 2 2 of Fig. 1.

Figure 3 is a view in elevation of a cleaning device embodied in myimproved furnace, and which will be more to later.

Referring now in detail to that embodiment of the invention illustratedin the accompanying drawing, 5 indicates as a whole, the combustionchamber and 6 the outer casing which encloses the combustion chamber insuch a manner as to provide an air space about the same. As shownherein, the furnace is of the round type as distinguished from thesquare or rectangular type.

The combustion chamber is made up of a plurality of sections, placed oneupon the other, said sections having the usual tongue fully referred'and groove construction at their ends to prevent lateral displacementand to assist in making a good, tight joint between the sections.

7 indicates the ash pit section. This section is made of cast metal andhas a hori- Zontal base flange 8 which defines the outside diameter ofthe furnace, and inwardly and outwardly extending radial top flanges 9and 10 respectively, of a diameter defining the desired grate baropening at the top end of said section. The ash pit section has a secondopening 11 at its front, for the removal of ashes therefrom, the top ofthis opening being defined by a horizontal wall section 12. In theflange 9 is provided suitable openings to secure the rear end trunnionsof the grate bars 13. The front ends 14 of the grate bars have bearingin clips 15 and 16 secured to the flange 9 and to the horizontal wallsection 12 respectively. Each grate bar extension has a gear 17, so thatall of the grate bars may be operatively connected together, the middlegrate'bar having the usual squared end to receive the crank for rockingsaid grate bar.

18 indicates the cast metal fire-pot section which rests upon the ashpitsection. Said fire-pot section tapers upwardly and outwardly from thebottom end and has a lateral rectangular, tubular extension 19 at itsfront, arranged in the vertical plane of the ash pit opening 11. Thistubular extension provides the fuel opening for the fire pot. Associatedwith the ash pot section and fire pot section is a front plate 2O whichhas openings to receive the eXtensions of said sections and finishes offthe front of the furnace. This front plate is secured to said extensionsby bolt or screws, and carries the ash pit door 21 and the feeddoor 22.Above the feed door, the front plate has an integral water pan 23.

Resting upon the top edge of the fire pot section, is a vheat radiatingsection 24, preferably made of a plurality of radially arranged parts orsegments. As shown herein, the said radiating section is made of twoidentical parts or halves 25, the ends of which have bolting flanges 26provided with tongues and grooves to insure proper t between the twoparts and prevent undue warping between said parts. Each part 25 of theheat radiating section has top, bottom and intermediate verticallyspaced webs 27, 28 and 29 respectively which converge er ,tapervinwardlyand upwardly toward the central vertical axis of the combustion chamberas a whole. The webs 28 and 29 are preferably 'integral lwith the firepot parts and are connected thereto at their outer bottom margins byradially disposed extensions 30 and 31 respectively, which are separatedfrom each other by annular openings 32 and 33 respectively. The web 27is made integral with web 28 and is connected thereto by semi-cylindricparts 34, struck about :the inner top` end of the'intermediate web 29 asa center. The outer 'marginal part oft-he top'web 27 is connected to theupright wall of the fire pot section but terminates short thereof asshown in Fig. 1'. Thus the webs define a tortuous of zigzag vpath Ior=channel through which the greater part of the products of combustion-rnust pass,` to" direct the heat thereof to the outer wall or shell ofthe radiating section. i

Resting upon the radiator section is a dome section 35 which convergesupwardly andiinwardly, `parallel with the web 27 of the'I radiatingSection toterminate in a vertically' disposed, axially arranged tubularextension 3,6, which includes a bearing spider 37, the purpose of whichwill'appear later. Engaged about` the tubular extension 36 is the elbowend 38 `of la rearwardly extending horizontal smoke conduit 39, theother end yofv which extends through a hole in the louter casing 6 to beconnected up with a sheet metal pipe section 40 leading to the chimney.i

Surrounding the fire pot section, radiator section and dome section, butspaced there- `from, is a Sheet metal jacket made up of sections 4l, 42and i43 which rest' the one -upon'the other, with inter-engagingrabbeted connections, the bottom sheet metal section 41 resting upon theflange' 1 0 of the ash pit section. Said jacket deines a space about thetop sections of the combustion chamber which is filled with aheat-'absorbing and retaining material 44, preferably granularfsuch assand.' This sand also acts to fill or seal such cracks or` crevicesasthere'may be between the sections and also such cracks as may developin'any of said sections, due to expansion and contrae tion(l Italsoprovidesan effective seal against the' escape yofi'gases and 'dust fromthel combustion chamber into the air heating space about the saine. i

" 45'indicatesa vcast metal scraper (see Fig. 8)"whicl` is of such shapeVaste extend diametrically across andyfit fin ithe'zig-Zag passagewaysforrnedv byA the web 28 and V29 of theradiatingsection and that` partofthe domeisectin 35 extending' parallel therewith. 'This scraperihasfthevnotches 4 6, 47 'to clear Asaidwebsfand the; edges of said :scrapersubstantially?. the .associated surfaces.

The scraper is fixed to the bottom end ol an upright axially disposedshalt 4S, which bears in the spider 37 and extends up through the smokeconduit to bear at its lop end in a bracket 49 fixed to the elbow endol" said Conduit. A bevel geur 50 is fixed to the top end of said shaftwithout the bracket and this bevel gear meshes with a .similar gear Y5lon the inner end of a forwardly ex-v tending horizoiital shaft 52. Theinner end of the shaft 52 also bears in the bracket il?) and the otherend thereof extends through and bears in the front part of the casingwall 6 where it is provided with any suitable. means without the casingfor rotating the same, as for instance the hand wheel 53.

The casing 6 cut away at thel Front to fit the front plate 20, and tothe lateral margins of which it is attached in any suitable manner,providing a tight joint there 3 between. Said casing has at its` rear,near the bottom end, an air `inlet pipe 54 and in the top wall of saidcasing are provided flanged openings 55 to receive the warm airconducting pipes 56, shown in dotted lines in Fig. 1.

In operation the greater part of the prod ucts of combustion rising fromthe lire pot will follow the tortuous path between the webs oftheradiating section so as to effectively conserve the heat thereof whichis taken up by said radiatingsection. This heat is absorbed and retainedb v the sand jacket so that its shell or casing becomes heated. Airentering the casing through the pipe 54 becomes heated by contact withthe sand jacket shell and rises to pass out through the pipes 56, 56.After the, pro lnets of combustion have passed through the lire dome,they will pass out through the conduit v39 to the chimney. Suchunconsumed products of combustion` as soot, will adhere to the webs ofthe radiating section and when it is so desired, the hand wheel 5?, isgiven aturn or two so as to rotate the scraper 45 which will scrape thesoot from the adjacent parts. This soot will fall back into the hre potto be again burned. Thus excessive smoking at the chimney or stack iseliminated. No gas or dust can pass through the sand jacket to come intocontact with the air being warmed, consequently the warmed airdeliveredr t0 the living rooms is clean and free from dust or sootparticles. .The sand rjacket will retain the. heat for a long time afterthe fire has gone out, so that a substantial sa-vingin fuel isaccomplished. l `While in describing my invention l have referred tocertain details ofvmechanical construction and arrangement of parts, ldo not wish to be limited thereto except as pointed out inthe appendedclaims'.

' I claim as my invention 1. In a warm air heating furnace, thecombination' ofa cinnbustion chamber including a fire pot section and adome section, a casing enclosing the combustion chamber and providing anair space about the same, a sheet metal acket made of sections spacedfrom but surrounding the combustion chamber and extending from thebottom of the fire pot section to the top of the dome sec tion thereof,where it is open at the top, and a iiller of granular heat absorbing andretaining material in the space between the combustion chamber sectionsand said sheet metal jacket sections.

2. In a warm air heating furnace, the combination of a combustionchamber made up of-ash pit, fire pot, radiating and do-me sections,resting the one upon another in the order named, the ash pit sectionincluding an outwardly extending radial iiange at its top end, a sheetmetal jacket made up of bottom intermediate and top sections which areassociated with, but spaced from the fire pot, radiating and domesections of the combustion chamber, the bottom sheet metal jacketsection resting on the radial flange of the ash pit section, and afiller of granular, heat absorbing and retaining material between saidsheet metal jacket sections and the associated combustion chambersections.

3. In a warm air heating furnace, in cornbination of a combustionchamber including aiire pot section, a dome section and an intermediateradiating section, said last named section having webs defining Zig-Zagpassageways through which the products of combustion must pass, and adevice for removing accumulations from the surfaces of said webs, whichwebs direct the removed accumulations back into the re pot section.

4:. In al warm air heating furnace, the combination of a combustionchamber including a fire pot section, a dome section and an intermediateradiating section, said last named section having webs defining Zig-zagpassageways through which the products of combustion must pass, and acleaning device capable of a rotary movement arranged in said zig-zagpassage-Ways for removing accumulations from the surfaces of the websdefining said passageways, which webs direct the removed accumulationsback into the fire pot section, and means operable from without thecombustion chamber for imparting a rotary movement to said cleaningdevice.

5. In a warm air heating furnace, the combination of a combustionchamber including a fire pot section, a dome section and an intermediateradiating section, the said last named section being made up of aplurality of parts, each having webs defining zig-zag passagewaysthrough which the products of combustion must pass, and a cleaning`blade in said passageways and capable of being rotated from without thecombusticn chamber for removing accumulations from said webs whichdirect the removed accumulations back into the fire pot section.

6. In a warm air heating furnace, the combination of an outer casing, acombustion chamber in said casing and defining therewith an air heatingspace, said combustion chamber including a iire pot section, a domesection a-nd an intermediate section, a smoke pipe connected with thedome section and extending horizontally through the casing, the domesection and intermediate section defining a Zig-Zag passageway for theproducts of combustion, a cleaner blade rotatable in said passageway, anupright shaft to which the blade is attached, a bracket carried by thesmoke pipe, in which the top end of the shaft has bearing, and a memberextended through the casing, operatively connected to the shaft and`operable from without the casing, for rotating the shaft.

In testimony that I claim the foregoing as my invention, I affix mysignature in the pDresence .of two witnesses, this 24th day of ecember,A. D. 1921.

JOSEPH SYLVAN.

Witnesses:

L. RUTH MEHLHoPn, T. I-I. ALFRnDs.

